New development in a fatal fire in Troy.  

Police now say they believe the fire that killed 19-year-old Vanessa Milligan and her unborn baby on April 3rd was deliberately set, and they are now treating the case as a double homicide.

Troy Police Capt. John Cooney will not confirm if Milligan's cause of death was the fire or if she died before the fire was set.

Police say they're asking for the public's help in providing information that might lead to an arrest. 

Milligan was due to give birth almost at any time when she was killed in the fire.